Related by context. Frequent words. (Click for all words.) 67 GRB # 65 X ray emission 63 XMM Newton 62 solar corona 61 gamma ray burst 60 visible wavelengths 60 GRBs 60 Gamma ray bursts 59 Crab Nebula 59 supernova remnant 58 comet tail 58 distant galaxy 58 magnetar 58 active galactic nuclei 58 Hubble observations 58 Type Ia supernovae 58 faint glow 57 NASA Cassini spacecraft 57 innermost planet 57 Galaxy Evolution 57 galaxy cluster 57 cosmic microwave background 56 redshift 56 redshifts 56 microlensing 56 Eta Carinae 56 auroral 55 WASP #b 55 photometry 55 accretion disk 55 gamma ray bursts 55 comet nucleus 55 gravitational waves 55 quasars 55 phosphorescence 55 infrared wavelengths 55 HD #b [002] 55 celestial object 55 luminosity 55 star Gliese 55 gravitational wave 55 supernova explosion 55 interstellar dust 54 Comet McNaught 54 distant galaxies 54 aurorae 54 supernova remnants 54 Hawking radiation 54 supernova 54 sunspot 54 Cepheids 54 magnetic reconnection 54 HiRISE camera 54 radial velocity 53 Gamma rays 53 extrasolar planet 53 unaided eye 53 gravitational lensing 53 Voyager spacecraft 53 magnetars 53 NASA Chandra 53 infrared telescope 53 interplanetary spacecraft 53 astronomical objects 53 Cassini orbiter 53 dwarf galaxy 53 photometer 53 X ray telescope 53 shorter wavelengths 53 quasar 53 X ray Observatory 53 observable universe 53 COROT 52 Saturn moon Enceladus 52 heliosheath 52 interferometry 52 meteoroid 52 WMAP 52 planetary nebula 52 gamma rays 52 galaxy clusters 52 WFC3 52 Andromeda galaxy 52 Orion Nebula 52 gamma ray 52 infrared imagery 52 Geminids 52 auroras 52 planetary nebulae 52 Very Large Array 51 ejecta 51 ecliptic 51 solar nebula 51 supernova explosions 51 NICMOS 51 Space Telescope 51 coronal mass ejection 51 WIMPs 51 reddish hue 51 cosmic rays 51 Higgs particle